Spain/Portugal Itinerary?

We’re hoping to go to Spain (and possibly Portugal) for 11-12 days in October. Our current plan is to fly into Lisbon and spend about 3 days, then get a short flight to Seville. We are hoping to spend a few days here and are considering a day trip into Granada while we are in Seville as well. From Seville we are planning to take the train to Barcelona and spend the rest of the trip there. From those who have been there, does this seem doable in this time frame, or is this trying to do too much? Should we do an overnight in Granada? We are not looking for crazy night life, more just experiencing history, beautiful sights, and great food/drinks. Any advice would be greatly appreciated!